Roller bit



1, 1939- Y M. D. CARLETON 6 ROLLER BIT Filed Nov. 4, 1938 3 1 vumfwo Patented Aug. 1, 1939 UNITED s'r r ROLLER. err: .51

Michael 1). Carleton, nausea-"rea e t; to I I Reed Roller Bit Company, Houston, Tex., a

corporation of Texas Application November 4,1938,

'vjolaims. 1 (on. 255971) ,1

This inventionrelates generally to drilling bits and specifically to roller. bits for the drilling of. wells. y

It has for its specific object the provision of a new andimproved cross roller assembly and bearings therefor.

Other objects will hereinafter appear. The preferred embodiment of the invention is illustrated by the accompanying drawing where- Fig. 1 is a sectional elevation of the bit;

Fig. 2 is a bottom plan view; and, c

Fig. 3 is a detailed view illustrating the connection of one of the cross roller cutters. to the bush- I In the drawing, the bit head is indicated at 'i. It has on its upper end a screw threaded shank 2 for connection with the conventional drill stem, not shown. The head has four depending bearing projections to support the cutter assembly, the oppositely disposed bearing projections for the cross roller assembly being indicated by the numerals 3 and 4 and one of the oppositely disposed bearing projections for the side roller cutters being indicated by the numeral}.

The side roller cutters are indicated by the numerals 6 and I of the two groups of the cross roller cutters on opposite sides of the bridge 9, by the numerals 9 and I0.

The general construction of bits of this type is well known and is illustrated by such patents as the patent to Stanclifl 1,998,793 and the patcut to Harrington 2,056,320. To permit the assembly of the bearings hereinafter described, the bearing projections may be made separate from the head andwelded to the head as indicated at 9---A- and 4-A in a manner well known to those skilled in the art.

Referring now to the new and improved cross roller assembly provided by this invention, it will be noted that on the cross roller pin II on each side of the bridge 9 are roller bearings l2 and ltfltting in grooves in the cross roller pin ll; 45 that upon the roller bearings I2 is a bushing ll extending into the projection 3 and into the bridgel; andupon the roller bearings I3 is a bushing it extending into the projection l and bridge 9. Upon the bushing ll are a plurality of cross 50 roller cutters 9 revoluble independently of each other; and upon the bushing I! are a plurality of cross roller cutters III revoluble independently of each other. Between the cutters 9 are sealing rings 25; between the projection 3 and the ad- 66 jacent cutter, a sealing ring I6; between the Serial No. 238,710.. I

bridge 8. andthe adjacent cutter. a sealingringi ll; betweengthecutters 10 are sealingrings l8; ,between' theprojection .4 and the'adjacentgcute ter, asealing: ring :1 I 9 and between. the :bridge and the adjacent cutter a sealing ring-2B.

In Fig. 3 the bushing l5--A and the cutter l0-A are made integral so that the latterwill efiect rotation of the former. It will be understood that for this purpose any of the cutters in may be made integral with the bushing I5, 10 and any of the cutters 9 may be made integral with the bushing l4.

While the invention will be found particularly useful in cross roller cutter. assemblies, it will 15 be apparent to those skilled in the art that it may be utilized in other bits.

The bushings l4 and IE will serve to exclude from the roller bearings l2 and IS the abrasive fluid and foreign matter. The roller cutters 9 and it! are free to rotate independently of each other, and the bushings l4 and ii are free to rotate on the roller bearings I2 and I3. To insure rotation of the bushings, one of the cutters may be made integral therewith, or otherwise 25 connected thereto, as shown by Fig, 3. The sealing rings l5, l6, l1, l8, l9 and 20 will serve to prevent the entrance of abrasive fluid or other foreign matter between the cutters and between the cutters and bushings.

The operations and various advantages of this invention in cross roller bits and other bits will be apparent to those skilled in the art.

I claim:

1. In a roller bit, a head having a pair of op- 5 positely disposed depending bearing projections; a bridge between said projections; a pin extending from said bridge in opposite directions to said projections; rolling bearings on said pin; a bushing on said bearings on each side ofsaid 40 bridge and extending into said bridge and the adjacent projection; a group of roller cutters on each of said bushings, said cutters being revoluble independently of each other; sealing rings between said cutters and between said projections and bridge and the cutters adjacent thereto; one of each group of said cutters being, connected to its bushing for rotation therewith.

2. Ina roller bit, a head having a pair of oppositely disposed depending bearing projections; I a bridgebetween said projections; a pin estending from said bridge in opposite directions to said projectlonsprolling bearings on said pins:

a bushing on said bearings on each side of said bridge and extending into'said bridge and the adjacent projection; a group of roller cutters on each of said bushings, said cutters being revoluble independently of each other; sealing rings between said cutters and between said projections and bridge and the cutters adjacent thereto.

3. In a. roller bit, a head having-a pair of oppositely disposed depending bearing projections; a bridge between said projections; a pin extending from said bridge in opposite directions to said projections; rolling bearings on said pin; a bushing on said bearings on each side of said bridge and extending into said bridge and the adjacent projection; and a group of roller cutters on each of said bushings, said cutters being revoluble independently of each other.

4. In a roller bit, a head having a pair of oppositely disposed depending bearing projections; a bridge between said projections; a pin extending from said bridge in opposite directions to said projections; rolling bearings on said pin; a bushing on said bearings on each side of said bridge and extending into said bridge and the adjacent projection; and a group of roller cutters on each of said bushings, said cutters being revoluble independently of each other; one of each group of said cutters being connected to its bushing for rotation therewith.

5. In a roller bit, a head having a pair of oppositely disposed depending bearing projections;

bridge and extending from said bridge to the' a adjacent projections; and a group of roller cutters on each of said bushings, said cutters being revoluble independently of each other.

6. In a roller bit, the combination of a pin; rolling hearings on said pin; a bushing on said rolling bearings; and a plurality of roller cutters on said bushing, said cutters being revoluble independently of each other, and one. of said cutters being connected to said bushing for rotation therewith.

7. In a roller bit, the combination of a pin; rolling bearings on said pin; a bushing on said rolling bearings; and a plurality of roller cutters on said bushing, said cutters being revoluble independently of each other.

MICHAEL D. CARLE'ION. 

